Brush-holder.



PATENTED MAY l2, 1903.y

A. F. BATGHELDER.

BRUSHfHOLDER. APPL'IOATION FILBDVSEPT. 3,1901.

I0 MODEL.

lm/eror', Pls@ F. Batchelder'.

PHZJCLJ.

UNITED STATES Patented May 12, 1903.

PATENT OFFICE..

ASA F. BATCHELDER, OF SCI-IENECTADY, NEW YORK, ASSIGNOR TO GENERALELECTRIC COMPANY, A CORPORATION OF NEWT YORK.

BRUSH-HOLDER.

SPECIFICATION forming part of Letters Patent No. 727,571, dated May 12,1903.

Application filed September 3, 1901y Serial No. 74,245. (No model.)

T0 @ZZ whom/,it may concern:

Be it known that I, AsA F. BATCHELDER, a citizen of the United States,residing at Schenectady, county of Schenectady, State of `New York, haveinvented certain new and useful Improvements in Brush-Holders,of whichthe following is a specification.

This invention relates to dynamo-electric machines; and its object is toprovide an improved brush-holder. The invention is especially applicableto the electric air-compresser shown and described in my application ledSeptember 3, 1901, Serial No.Y 74,244.

The brush-holder hereinafter set forth embodies several features of theone patented by E. D. Priest April 24, 1900, No. 684,052. It has a boxaffording aguide for the carbon brush and a receptacle for the springwhich forces the presser-bar against said carbon. The box is supportedby a stud insulated from the box and covered bya refractory insulator.The stud is secured in a clamp which is fastened to a bracket on thehead of the motorcasing. My improvements consist in making the studadjustable radially of the commutator, so that the brush-holder can bemoved inwardly as the commutator wears without changing the point ofcommutation, in providing the presser-bar with a tailpiece to enable itto be more easily and safely manipulated, and in the modifiedconstruction of the other parts, as pointed out below.

In the accompanying drawings, Figure 1 is a side elevation of aright-handed brushholder. Fig.v 2 is a cross-section on line 2 2,Fig. 1. Fig. 3 is a partial longitudinal section of the same. Fig. 4 isa cross-section on line 4 4, Fig. Fig. 5 is a side elevation, partlybroken away, of a left-handed brushholder. Fig. Gis a sectionalelevation of the same on the line 6 6, Fig. 5.

The brush-holders are forconvenience made right-handed and left-handedand are attached to the inside of the head of the casing,

somewhat as shown in the patent to E. D. Priest, December 14, 1897, No.595,410. The casing-head A has an integral bracket a for each brush. Onthis rests a plate B, having a hole for a fastening-bolt b and carryingat one side an obliquely-arranged sleeve B, split longitudinally at band provided with a transverse screw C for clamping the split sleeveupon the upper end of a stud D. A key d, fitting in longitudinal groovesin the sleeve and the stud, keeps the latter in a tixedangular positionwith reference to the sleeve, but permits it to be axially adjustedtherein. The lower end of the stud is rmly secured in a socket in abrush-carrier E and insulated therefrom as follows: Dry mica insulationis formed into a tube F, one end of which is inserted into t-he socket ein the carrier E. Anl expansible lining G of sheet metal, preferablymade in halves, as shown in Fig. 4, is then inserted into the tube F,and the studD is then driven into said lining, expanding it and the micaand wedging them and the stud tightly in the socket e. A mica washer fis then set into the lower end of the socket, and a tubular protectorI-I, of porcelain, rubber, or the like, is slipped over Vthe stud toprotect the mica above the carrier E. The upper end of the stud can thenbe inserted into the split sleeve B and clamped by the screw C. Theprotector I-I affords a smooth hard surface which can be wiped clean atintervals, Whereas the mica tube would soon be broken by wiping if theprotector were not used. The outer surface of the protector ispreferably beaded or corrugated, as shown, to aord a longercreeping-surface in case the current attempts to leak over it.

The brush-carrier E has a hub e', contain-` ing the socket e, in whichthe stud Dis fixed,

.and an offset receptacle'ez, having an open top and containing at oneend a slot or guide for the carbon brush I. Resting on the upper end ofthe brush is a curved block K, secured to the end of the at presser-armK', which is secured to the dat upper side of a block L, pivotallymounted on a pin M, extending across the receptaclee `On each side ofthe block is a star-shaped Wheel N, supporting oneportion ofu thedouble-coiled spring P, Whichhas a middle loop 19 lying over the arm K.The extremities offthe two coiled portionsV are'hooked or otherwisesecured to a transverse pin M or other fastening.

It Will be seen that the plate B and bolt b coperate with the obliqueclamping-sleeve and axially-adjustable stud to afford ample Iooopportunity for adjusting the brush-holder to meet the requirements ofservice. The stud is arranged with its axis radial to the comm utator,so thatit can be adjusted length- Wise when the commutator wears downwithout altering the point of commutation. lt also makes a strong,rigid, and compact structure. The presser-arm extends to the rear of theblock L, forming a tailpiece 7c', which enables one to lift thepresser-block K easily, quickly, and safely when it is desired to removethe brush. 1n Fig. 1 the presser-baris shown in dotted lines at :c inthe position it takes when thus pressed back. Position y is the one ittakes when in Contact with a brush which is nearly worn out, the end ofthe receptacle being slotted at e3 to permit the arm to follow the brushdown. The lead S for conveying current to the brush is attached to thereceptacle e2.

W hat I claim as new, and desire to secure by Letters Patent of theUnited States, is-

1. In a brush-holder, attaching means comprisinga plate havingabolt-hole, and a sleeve integral with said plate and located with itsaxis oblique to the axis of the bolt-hole.

2. In a brush-holder, attaching means coinprising a plate having abolt-hole, a split sleeve supported by said plate with its axis obliqueto that of the bolt-hole, and a clamping device for said sleeve.

3. In a brush-holder, attaching means comprising a plate having abolt-hole, a split sleeve supported by said plate in an obliqueposition, and a clamping-screw transverse to the split in the sleeve.

4. A brush-holder having a stud, and a clamping-sleeve for said studprovided with a securing-plate extending laterally and obliquely to saidsleeve.

5. A brush-holder having a metallic stud insulated therefrom, arrangedwith its axis radial to the commutator, and a stationary metallicclamping device engaging the outer end of said stud.

6. A brush-holder having a stud arranged with its axis radial to thecommu tator, a split sleeve receiving the outer end of said stud, a

key preventing angular movement of the stud in said sleeve, and a screwfor clamping said sleeve on said stud.

7. A brush-holder comprising a metallic clamping-sleeve, a stud engagedby and adjustable in said sleeve radially to the commutator, and aninsulated brush-carrier on the inner end of said stud.

8. In a brush-holder, a presser-bar having a tailpiece extending in therear of its pivotal point, and a spring engaging the presserbar in frontof its pivotal point.

9. In a brush-holder, the combination with a pivoted block, of apresser-bar secured to said block and having a rearward extension.

10. In a brush -holder, the combination With a stud, of a brush-carrierhaving a hub provided with a socket receiving said stud, and an offsetspring-receptacle located by the side of said hub, having an open top, aslotted guide at one end for the presser-bar and a slot at the other endfor the tailpiece of said bar.

11. ln a brush holder, the combination with a stud, of means forsupporting it With its axis oblique to the plane of the support, and abrush-carrier fixed upon and insulated from the stud.

12. In a brush holder, the combination with a stud whose axis is radialto the commutator, of a support for the stud having a fastening devicein a plane oblique to the axis of the stud, and a brush-carrier Offsetfrom the axis of said sind and insulated therefrom.

13. In a brush holder, the combination with a stud whose axis is radialto the commutator,of a support having a fastening device in a planeoblique to the axis of the stud, a brush-carrier insulated from the studand offset therefrom, and a tubular beaded protector surrounding thestud between said carrier and the support.

In witness whereof I have hereunto set my hand this 30th day of August,1901.

ASA F. BATOHELDER.

Vitnesses:

HENRY J. THON, M. H. EMERSON.

